<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>菜鸟教程(runoob.com)</title> 
<style>
.Grid{
    display: flex;
    border: 1px solid;
    width: 200px;
}

.Grid-cell {
    border: 1px solid red;
}

.Grid-cell2 {
  display: flex;
  flex-wrap: wrap;
  flex-grow: 1;
  flex-basis: 0%;
  height: 50px;
  border: 1px solid red;
}

</style>

</head>

<body>
    <div class='Grid'>
        <div class='Grid-cell'>df</div>
        <div class='Grid-cell2'>
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        </div>
        <div class='Grid-cell'>df</div>        
    </div>

</body>

</html>